Safety lock



July 6,1926 1,591,476

J. DORNETH SAFETY LOCK Filed April '7, 1924 2 Sheets-Sheet 1 July 6 1926. I

J. DORNETH SAFETY LOCK Filed April '7, 1924 2 Sheets-Sheet 2 efiwezziarx J. Dal-wreath 9 2 a gtbigys.

Patented July 6, 1925.

UNITED STATES J rUs noa mrn, or KQllRAQSH QlIE, lanai recur, GER-MANY.

SAFETY LOCK.

Application filed April 7, 1324, Serial No. 704,883, and in Germany February 16, 1923.

The subject of this invention is a safety lock having one or several bolts and radially slida'ble tumblers locking a cylinder by which the bolts are retracted, which tum blers coact with a ring of fixed locking members, and has for its'object primarily, to provide a lockwhi'ch locks automatically, on the door being closed. For this purpose a loaded spring is provided, which is released on the door being closed and draws the bolts into the locking position. This movement of the bolts in the closing position, however, is only possible it the cylinder is also correspondingly turned. As the latter is locked by the tumblers which engage in the fixed locking ring, according to the present invention thedockirig ring and tumblers are constructed in such a manner that the action of the springs upon the bolts for bringing the latter in the locking position allows the cylinder to be turned the tumblers moving out of engagement with the locking ring when the bolt is being shot by the springs or moving back into engagement with other parts ot'the locking ring when the bolts are shot.

For the purpose of explaining the invention an example embodying the same has been shown in the accompanying drawing in which the same reference characters have been used in all the views to indicate corresponding parts. In said drawing,

.Fig. 1', is a front elevation of the safety lock, and

Fig. 2, is a section through the same to an enlarged scale.

Figs. 3 to 5, show a bolt with the spring for causing it tolock automatically, shown in three positions.

Figs. 6 and 7, are views of the ring of fixed locking members, and

Figs. 8 to 12 are details.

in the base plate 1 the tubular part 5 for the insertion of the key is rot-atably mounted, the cylinder 4 being fixed to the part 5. In the wall of the cylinder and in the tubular part 5, the tumblers 11 are guided, which coact' with a ring ot fixed locking members 2, (described in detail below), which is mounted ontlie base plate 1'. By inserting theke'y' into" the tubular part 5, the tuni- -bl er s11 are forced radially outwards and are" thereby released t'ro'm'the ring of fixed locking members 2, so that the tubular part 5 together with the cylinder fl can be turned. Qn the 'ltey being withdrawn, a helical spring 14 passing through the tumblers 11 (Figs. 8 and 9) draws the said tumblers back again radially towards the centr whereby the cylinder 1 is again locked.

A double lever a is operatively connected to the cylinder 4, at the ends of which lever, bolts 7 are attached, which pass through the supporting plates 8 and 9. At the outer end of one of-the bolts a cranked lever Z1 is pivotally mounted, to the shorter arm of which a spring 0 is attached, the free end of which is fixed to" the supporting plate 8. The longer arm of the cranked lever 72 passes through an opening" in the plate 8 and below where it passes through the plate, is provided with a shoulder (Z, Before the door is closed, that'is when the bolt 7 is withdrawn, ithe parts are in the position shown in Fig. 4 in which, with the spring 0 intension, the shoulder d rest-s against the support or staple 8 and prevents the spring drawing up the bolt. On the door being completelyclosed, the outer end of the cranked lever strikes against the staple 9 whereby the shoulder at is disengaged from the staple 8 and the bolt 7 is drawn up by the spring 0 (Fig. 8),- the locking action thus taking place automatically. When,

on the door being opened, the bolt is withdrawn by means of the key, the spring 0 turns the cranked lever b so that the outer end of the said lever will rest against the bottom of the staple 9 (Figs. 1 and 3), whereby the boltis held in the withdrawn position and the key can be withdrawn from the lock.

In order to bring the bolts 7 automatically into the locked position, it is necessary, that the cylinder may be turned by the spring 0, thatis, the ring of tired locking members 2 must be so constructed as to allow ot the cylinder being turned in the direction tor locking the bolts (see the arrow 0 in Figs. 1 and For this purpose the ring ot fixed locking members 2, composed of round pins f in-serted close to one another in the base plate 1, the parts projecting from the plate 1 being cut away as to one ha lf, so that the said parts are semicircular in cross sec t'ion. The tumblers 11 lie in'the cutaway parts 9 of the said pins. There are lti pins and 16 cut-away airrs'g, but only half that number of t'umblers'11, so that, the cylinder can occupy sixteen locking positions, that is, twice-as many positions is there are tumblers ll.

The inward pointing ends of the tumblers 11 (Figures 8 and 9) are provided with two guide pins h which extend into the tubular part 5 for the key and the form of which corresponds to the wards on the key. The tubular part 5 is divided in the middle by a partition 76, which is important, as by this means the inner tumblers or their guide pins, are covered to the outside. If the outer pins are destroyed during an attempted burglary, the inner pins are not visible and are protected from being destroyed. The disc i is in the form of a cup, and it is preferably made from a circular sheet metal blank, by indenting the same at its margin and bending the tongues thus produced upwardly, so as to produce a cup shaped cylinder having its flangen formed with slots 7) (Fig. 10).

The lock operates in the following manner:

On the tumblers 11 being forced outward by the key, the pins f of the ring of locking members 2, lie in the recesses 1 (Fig. 9) of the tumblers, so the tubular part 5 together with the tumblers 11 and the cylinder 4-, in which they are guided, can be turned to the right or left by means of the key, according to whether the lock is to be locked or unlocked. lVithout the key, that is, when the tumblers 11 are forced inwards by the spring 1.4:, the cylinder t with the tumblers can not be turned to the left, that is into the open position, as the tumblers rest against the straight surfaces of the pins f. It is however possible to turn the cylinder to the right, that is, into the locked position, as in this case the circular parts of the pins press against the tumblers and can move the latter outwards. In order to facilitate this movement, the inner edges of the tumblers may be chamfered off at m. This turning to the right is effected by the spring 0, on the door being closed.

In order to prevent the bolts being sa-wn or filed through, after the door has been forced in from the outside, even when they are mounted on the inside of the door, the bolts 7 are made of an outer tube (Fig. 12) and an inner core, which is so loose in the outer tube that it will turn as soon as the tool reaches it, after the outer tube has been destroyed. Owing to this turning motion, the tool is unable to act properly on the core. This construction may be applied to all kinds of door securing-means, and with all ban shaped parts of the same,'w11ere there is a danger of these parts being sawn through.

I claim:

1. In asafety lock the combination with a bolt, of a key rotatable cylinder connected to the bolt, tumblers radially slidable in the said cylinder, 2 ring of fixed locking members releasably engaging the tumblersand adapted to hold the cylinder from rotation in one. direction only, and a spring coacting with the bolt for moving the bolt into closing position and for turning the cylinder, substantially as and for the purposes set forth.

2. In a safety lock, the combination, with the bolt, of normally locked means tending to move the bolt into locking position, means operative when closing the door for releasing said means, key actuated tumblers, and holding members for said tumblers, said tumblers and holding members being constructed so as to permit of movement relative to each other and thereby allow the cylinder to rotate when the bolt moves into locking position.

3. In a safety lock, the combination, with the door, its frame, a rotary cylinder adapted to be engaged by a key, key actuated tumblers mounted in said cylinder and movable in radial directions, and holding members for the tumblers, said tumblers and holding members being constructed so as to permit of relative movement with respect to each other and thereby allow the cylinder to'rotate when moving said bolt into locking position, of a bolt operatively connected with the cylinder, automatic means tending to shoot the bolt into locking position, and means adapted to be released when closing the door for holding the bolt in nonlocking position.

4:. In a safety lock, the combination, with the door, its frame, a rotary cylinder adapted to be engaged by a key, key actuated tumblers mounted in said cylinder and movable in radial directions, and holding members for the tumblers, said tumblers and holding members being constructed so as to permit of movement relative to each other and thereby allow the cylinder to rotate when moving said bolt into locking position, of a bolt operatively connected with the cylinder, bolt holding members disposed respectively on the door and its frame, a spring actingron said bolt and tending to move the same into closing position, a device connected with the spring and adapted for engagement with said holding member on the door for holding the bolt in non-locking position and to be released by the holding member on the frame when closing the door.

5. In a safety lock, the combination, with the door. its frame, a rotary cylinder adapted to be engaged by a key, key actuated tumblers mounted in said cylinder and movable in radial directions, and holding members for the tumblers, said tumblers and holding members being constructed so as to permit of relative movement with respect to each other and thereby allow the cylinder to, rotate when moving said bolt into locking position, of a bolt operatively connected with the cylinder, bolt holding members disposed respectively on the door and it v frame,

a spring acting on said bolt and tending to more the same into closing position, a device connected with the spring and adapted for engagement with said holding member on the door for holding the bolt in nonlocking position and to be released by the holding member on the frame when closing the door, said device being adapted When the door is closed and the bolt in non-locking position to be engaged by said holding member on the frame for holding the bolt in nonlocking position.

6. In a safety lock, the combination, With a rotary cylinder having two sockets open at opposite sides of the look, a partition wall 15 separating the sockets and a key adapted to be engaged with the sockets, of radially movable tumblers mounted in said cylinder, and radially projecting into both sockets so as to be operated from opposite sides of the 20 lock, locking members for the tumblers, and a bolt connected with said cylinder.

In testimony whereof I hereunto affix my signature.

JULIUS DORNETH. 

